US3397580A - Pressure ratio transducer - Google Patents

Pressure ratio transducer Download PDF

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Publication number
US3397580A
US3397580A US486114A US48611465A US3397580A US 3397580 A US3397580 A US 3397580A US 486114 A US486114 A US 486114A US 48611465 A US48611465 A US 48611465A US 3397580 A US3397580 A US 3397580A
Authority
US
United States
Prior art keywords
lever
transducer
pressure ratio
yoke
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US486114A
Other languages
English (en)
Inventor
Ambrosio Michael A D
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RTX Corp
Original Assignee
United Aircraft Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Aircraft Corp filed Critical United Aircraft Corp
Priority to US486114A priority Critical patent/US3397580A/en
Priority to DE19661573915 priority patent/DE1573915B2/de
Priority to GB34936/66A priority patent/GB1113830A/en
Priority to SE12062/66A priority patent/SE326314B/xx
Application granted granted Critical
Publication of US3397580A publication Critical patent/US3397580A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • G01L11/004—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by the use of counterbalancing forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L15/00—Devices or apparatus for measuring two or more fluid pressure values simultaneously

Definitions

  • drive means comprising a member moving linearly along a straight line located at a constant distance from the arm axis moves the arm to a position at which the lever and the arm are aligned.
  • My invention relates to a pressure ratio transducer and more particularly to an improved pressure ratio transducer which is simple, inexpensive, reliable and which has increased sensitivity and accuracy.
  • My transducer is not appreciably aiected by changes in temperature. All parts of the transducer have a relatively long life. My device has a sensitivity which is substantially independent of pressure level.
  • One object of my invention is to provide a pressure ratio transducer which is reliable, simple and inexpensive for the result achieved thereby.
  • Another object of my invention is to provide a pressure ratio transducer, the sensitivity of which is independent of pressure level.
  • a further object Iof my invention is to provide a pressure ratio transducer, the output of which is not appreciably affected by changes in temperature.
  • Still another object of my invention is to provide a pressure ratio transducer, the parts of which have a relatively long life.
  • my invention contemplates theprovision of a pressure ratio transducer in which I apply input pressures along orthogonal axes to a lever pivotally supported on a yoke at a point remote from the yoke axis of rotation.
  • a sensor responsive to angular movement of the lever in response to a difference in the resultant pressures along the orthogonal axes drives the yoke to a null position at which the lever and yoke are aligned, thus to provide a measure of the pressure ratio.
  • FIGURE 1 is a perspective view illustrating my pressure ratio transducer with parts broken away and with other parts shown in section.
  • FIGURE 2 is a top plan view of my pressure ratio transducer with parts broken away.
  • FIGURE 3 is a sectional view of my pressure ratio transducer immediately below the top thereof.
  • FIGURE 4 is a fragmentary view of my pressure ratio transducer with Iparts broken away and with other parts shown in section. L
  • FIGURE 5 is a fragmentary sectional view of a portion of my pressure ratio transducer drawn on an enlarged scale.
  • FIGURE 6 is a diagrammatic view illustrating the operation of my pressure ratio transducer.
  • FIGURE 7 is a side elevation of my pressure ratio transducer.
  • my transducer includes a cylindrical housing indicated generally by the reference character 10 having a top 12, a base 14 and spaced side wall portions 16, 18, 20 and 22.
  • I mount caps or bearing supports 24 over central openings 26 in the top 12 and base 14 by any suitable means such, for example, as by screws 28.
  • Supports 24 carry respective bearings 30 on stub shafts 32 pivotally to support a generally rectangular yoke indicated generally by the reference character 34 for movement around a vertical axis.
  • Yoke 34 may have a top carried by one of the bearings 30, sides 38 and 40 and a bottom 42 supported on the other bearing 30.
  • Bottom 42 has a slot 44 permitting the yoke to be driven in a manner to be described hereinafter.
  • My transducer also includes a generally rectangular lever indicated generally by the reference character 46 having a top 48, sides 50 and 52 and a bottom 54.
  • the top 36 and the bottom 34 carry respective pivot pins 56 at a location spaced from the axes of shaft 32. Pins 56 are received in bearings 58 carried respectively by the top 48 and by the bottom 54 of the lever 46 to permit the lever to pivot around the axis of pins 56.
  • the top 48 and the bottom 54 of the lever extend through openings 60 in the caps 24 and over the central openings in the top 12 and the base 14 of the housing.
  • I secure a rod 62 to the top 48 and to the bottom 54 of the lever 46 at the center thereof.
  • I mount respective bellows 64, 66, 68 and 70 on the walls 16, 18, 20 and 22 by any suitable means.
  • Walls 16, 18, 20 and 22 have openings 72 through which respective tubes '74, 76, 78 and extend to permit the introduction of Huid to the interior of the associated bellows.
  • I provide my device with means for applying the forces resulting from the application of pressures to the bellows to the rod 62.
  • rod 82 In response to pressure admitted to the interior of the bellows 64 which is, for example, greater than ambient pressure, rod 82 tends to move to the left 4as viewed in FIGURE 3, as the bellows expands to apply a force to the rod 62.
  • I provide my pressure ratio transducer with means for sensing displacement of the lever 46 from a null position at which it is aligned with the yoke 34.
  • the top 36 of the yoke 34 carries a pair of spaced electrical contact arms 114 and 116 mounted on the top 36 by insulating blocks 118 or the like. Arms 114 and 116 carry respective contacts 120 and 122 which are out of engagement with a contact 124 on the top 48 of the lever 46 when the lever top 48 is aligned with the top 36 of the yoke. When, however, the lever moves out of alignment with the yoke, one or the other of the contacts 128 and 122 engages contact 124.
  • I connect a capacitor 130 across the terminals of resistors 126 and 128 connected to the contacts. It will readily be appreciated that when one 0r the other of the contacts 120 and 122 engages contact 124 the corresponding resistor 126 0r 128 is shunted.
  • My system includes a servo motor 132 having windings 134 and 136 connected, respectively, between resistors 126 and 128 and a suitable source of voltage 138. When the system is in balance with the yoke and the lever aligned, the motor 132 will not be driven. If, however, one of the resistors 126 or 128 is shunted, motor 132 will be driven in one direction or the other.
  • Gearing 141 connects the output shaft of motor 132 to a pinion 142 carried 'by a worm shaft 144.
  • Worm 144 threadably engages a nut or follower element 146 having a bifurcated end 148 which slides on a guide rod 150; I so arrange the worm 144 and its nut 146 that the nut is driven in a direction parallel to the y axis, which is the common axis of rods 98 and 106, in response to rotation of the worm. In this manner, as is explained hereinafter, rotation of the worm may be correlated with the yoke angle 0. I provide the follower 146 with a drive rod 152 which rides in the slot 44 in the bottom 42 of the yoke.
  • buttons 155, 157, 159 and 160' of paramagnetic material mount the buttons and 161 on the support 100 for movement therewith. Buttons 157 and 159 are secured to the support 108 for movement therewith. It will readily lbe appreciated that when rod 62 moves the buttons likewise move. These magnets and buttons interact to provide a negative spring rate to compensate for the positive spring rate of the bellows, thus increasing the sensitivity of the system.
  • AIn order to provide an electrical signal which is an indication or measure of the force ratio I connect the input shaft 162 of an output transducer 164 to the shaft 148 of motor 132 by gearing 166.
  • the end of the lever carrying the contact 124 is displaced to engage that contact with either contact 120 or contact 122 to energize motor 132 to drive worm 144 in such a direction as will actuate the yoke 36 to move in a direction to move the contact out of engagement.
  • This operation may be stated in a number of ways. First, it causes the yoke top 36 and the lever top 48 to return to aligned positions. In doing this, it reduces the force component R sin to zero. In other words, it causes the longitudinal axis of the top 48 to be colinear with the resultant force R.
  • the rotational angle a of the lead screw is a measure of pressure ratio and of the angle 0 so that the rotation of the input shaft 162 of the transducer is proportional to tan 0.
  • a force ratio transducer for producing a signal indicating the ratio of two forces including in combination, a -lever having a longitudinal axis, means providing a movable pivot for said lever at a lrst point along said axis, means for applying a first force to said lever along a first line passing through a second point spaced along said axis from said irst point, means for applying a second force to said lever along a second line passing through said second point and forming an angle less than with said first line, said forces producing a resultant force acting on said lever, means for orienting said pivot to a position at which said lever axis and said resultant force are colinear, said orienting means comprising a second lever carrying said pivot, a support mounting said second lever for pivotal movement at a point thereon spaced from said pivot, drive means comprising a drive member constrained to move linearly along a straight line located at a xed distance from said second lever pivot, means operatively connecting said drive means to said
  • a transducer as in claim 1 in which said orienting means comprises a motor having a shaft for driving said drive member, the rotation of said shaft being proportional to the ratio of said forces.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
US486114A 1965-09-09 1965-09-09 Pressure ratio transducer Expired - Lifetime US3397580A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US486114A US3397580A (en) 1965-09-09 1965-09-09 Pressure ratio transducer
DE19661573915 DE1573915B2 (de) 1965-09-09 1966-07-29 Geraet zum messen des verhaeltnisses zweier kraefte
GB34936/66A GB1113830A (en) 1965-09-09 1966-08-04 Pressure ratio transducer
SE12062/66A SE326314B (is") 1965-09-09 1966-09-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US486114A US3397580A (en) 1965-09-09 1965-09-09 Pressure ratio transducer

Publications (1)

Publication Number Publication Date
US3397580A true US3397580A (en) 1968-08-20

Family

ID=23930626

Family Applications (1)

Application Number Title Priority Date Filing Date
US486114A Expired - Lifetime US3397580A (en) 1965-09-09 1965-09-09 Pressure ratio transducer

Country Status (4)

Country Link
US (1) US3397580A (is")
DE (1) DE1573915B2 (is")
GB (1) GB1113830A (is")
SE (1) SE326314B (is")

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA636236A (en) * 1962-02-13 Giannini Controls Corporation Null type mach meter
US3038339A (en) * 1958-03-21 1962-06-12 Colvin Lab Inc Pressure transducer
GB976293A (en) * 1961-09-13 1964-11-25 Gen Electric Improvements in pressure ratio sensor
US3162047A (en) * 1954-07-19 1964-12-22 Republic Flow Meters Co Ratio indicator
US3218864A (en) * 1962-08-07 1965-11-23 Honeywell Inc Force ratio apparatus
US3266320A (en) * 1963-06-13 1966-08-16 Garrett Corp Vector balanced pressure ratio transducer
US3299701A (en) * 1958-12-22 1967-01-24 Honeywell Inc Pressure control apparatus
US3312109A (en) * 1954-05-25 1967-04-04 Honeywell Inc Force ratio responsive device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA636236A (en) * 1962-02-13 Giannini Controls Corporation Null type mach meter
US3312109A (en) * 1954-05-25 1967-04-04 Honeywell Inc Force ratio responsive device
US3162047A (en) * 1954-07-19 1964-12-22 Republic Flow Meters Co Ratio indicator
US3038339A (en) * 1958-03-21 1962-06-12 Colvin Lab Inc Pressure transducer
US3299701A (en) * 1958-12-22 1967-01-24 Honeywell Inc Pressure control apparatus
GB976293A (en) * 1961-09-13 1964-11-25 Gen Electric Improvements in pressure ratio sensor
US3218864A (en) * 1962-08-07 1965-11-23 Honeywell Inc Force ratio apparatus
US3266320A (en) * 1963-06-13 1966-08-16 Garrett Corp Vector balanced pressure ratio transducer

Also Published As

Publication number Publication date
GB1113830A (en) 1968-05-15
DE1573915A1 (de) 1971-05-27
DE1573915B2 (de) 1971-12-30
SE326314B (is") 1970-07-20

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